A. weakly B. sadly C. quietly D. helplessly

According to the passage, the experience of helplessness causes rats to______.A．turn off t

【C12】A．incompetentB．powerlessC．hesitantD．helpless

He felt ______ at the ill-treatment of helpless animals.A．indignityB．indignationC．indulgen

－－Sorry, I have kept you waiting. －－__________________. A. I’m sad. B. I don’t care.

【B9】A．moralitiesB．virtuesC．advantagesD．weaknesses

If only he ____ quietly as the doctor instructed he would not suffer so much now. [ ]A. lies B. lay